You will need to create rules if you decide to pay for employees' overtime. Overtime payment rules work as multipliers of the base salary.
Example: John typically works 7 hours on Monday at £10 per hour for Employer XYZ. Last Monday, he worked for 8 hours instead. Employer XYZ has created an overtime payment rule for that situation. As a result, employees earn 50% more than their regular rate for every extra hour worked. So last Monday, John's salary was as follow:
Standard hours: 7 hours x £10 = £70
Overtime: 1 hour x (£10 x 1.5) = £15
Total: £70 + £15 = £85
Go to Profile > settings > shift management > Overtime pay rules